1. General Model Information

Name: Multiple Layer Aquifer Transport

Acronym: MULAT

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: partial differential equations (3D)
Main application: research
Keywords: steady state grondwater flow, advective contaminant transport, particle tracking, multple aquifers, transport retardation factor


Prof.dr.ir. A. Verruijt

Delft University of Technology Faculty of Civil Engineering
P.O.Box 5048
2600 GA Delft
The Netherlands
Phone:+31 15 278 5280
Fax : +31 15 278 3328



A program for the analysis of 3D steady-state groundwater flow, and the advective transport of particles, including linear adsorption and desorption. The model assumes flow in the aquifer to be mainly horizontal, with vertical flow from one aquifer to another through the resistance layers. The model handles up to six layers. The aquifers may be confined or unconfined, and may also be partly confined and partly unconfined. The flow of groundwater may be influenced by various types of wells, line sources, line drains and line screens (impermeable walls). The geometry of the problem can be described in a two-dimensional network of triangular elements in the x,y-plane. The model area is divided in to a number of triangular zones, each of which is homogeneous with respect to soil properties (permeability, porosity and retardation factor) and infiltration rate. Each of the zones is subdivided in a large number of triangular elements. This refinement is automatically performed by the program based on user-defined zone-refinement strategy. The particles, representing transport of pollutants, can be traced both in a forwards mode (downstream direction) and a backwards mode (upstream direction). Travel times can be marked on pathlines. It has a text-based user interface for program control and data input and editing. Results of mesh generation, head distribution and pathlines in 2D or 3D are displayed on screen or to a HPGL plotfile.

Source: Geoenviromental Software Directory

II. Technical Information

II.1 Executables:

Operating System(s): DOS MULAT is a commercial program. Supplier in USA is IGWMC Colorado School of Mines.Price: 500 US$

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: J. Bierwirth: 09.01.2001 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:46 CEST 2002

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